I have a 88 cherokee with a 4.0 auto. i recently replaced the tranny after it sat around for a year or so and now im having problems with it back firing threw the exaust and throttle body. it has zero throttle response idles really rough and will not idle for more then a minute. Jeep ran amazing before tranny went out i have replaced injectors and did a full tune up. Really need help please i have no idea what it could be thanks.